1. Check the signature column on the back of the credit card: CVV codes of credit cards are all located on the right side of the signature column on the back of the credit card, and they are a series of three digits.

2. Check the credit card bill or scanned copy: Some banks or credit card companies will mark the position of CVV code on the credit card bill or electronic scanned copy, so it can be found through these channels.

3. Call the bank for consultation: If you can't find the credit card CVV code by other means, you can call the bank or credit card issuer to inquire about the specific location of the CVV code and confirm it.